Decouple Vulkan context object destruction from retroarch's ContextDestroy call

libretro/LibretroVulkanContext.cpp

@@ -125,6 +125,13 @@ void LibretroVulkanContext::ContextReset() {
    LibretroHWRenderContext::ContextReset();
 }
 
+void LibretroVulkanContext::ContextDestroy() {
+   INFO_LOG(G3D, "LibretroVulkanContext::ContextDestroy()");
+
+   LostBackbuffer();
+   gpu->DeviceLost();
+}
+
 void LibretroVulkanContext::CreateDrawContext() {
    vk->ReinitSurface();
 

libretro/LibretroVulkanContext.h

@@ -5,7 +5,7 @@
 class LibretroVulkanContext : public LibretroHWRenderContext {
 public:
 	LibretroVulkanContext();
-	~LibretroVulkanContext() override {}
+   ~LibretroVulkanContext() override { Shutdown(); }
 	bool Init() override;
 	void Shutdown() override;
 	void SwapBuffers() override;
@@ -14,6 +14,7 @@ public:
 	void CreateDrawContext() override;
 
    void ContextReset() override;
+   void ContextDestroy() override;
 
 	GPUCore GetGPUCore() override { return GPUCORE_VULKAN; }
 	const char *Ident() override { return "Vulkan"; }